01990naa a2200229 a 450000100080000000500110000800800410001910000200006024501460008026000090022652013040023565000220153965000170156165000140157870000200159270000190161270000230163170000170165470000170167170000180168877300540170621311592021-04-08       2021    bl uuuu     u00u1 u    #d1 aBASTIANI, M. O.  aAmmonium sulfate improves the efficacy of glyphosate on South African lovegrass (Eragrostis plana) under water stress.h[electronic resource]  c2021  aSouth African lovegrass (Eragrostis planaNees) is the most important weed of native pastures insouthern Brazil. Management options are limited under water-stress conditions, and glyphosatehas been the main tool for control. This study compared four salts of glyphosate applied at threegrowth stages and determined the glyphosate tolerance level. In addition, the performance ofammonium sulfate (AMS) under two soil moisture conditions (50% and 100% of water-holdingcapacity) and the effect of AMS on absorption and translocation of radiolabeled [14C]glyphosatewere evaluated. The potassium salt of glyphosate had the fastest activity across growth stages ofE. plana, which is more vulnerable to glyphosate at the panicle initiation stage. Isopropylaminesalt was the slowest-acting glyphosate formulation. Younger plants were typically more easilycontrolled than older plants at the full tillering stage. The addition of AMS increased the level ofcontrol of drought-stressedE. planacompared with glyphosate alone by increasing transloca-tion out of the treated leaf and consequently increasing the concentration of glyphosate in theprimary culm. These data can be used to plan an effective management program forE. planathat takes into account the developmental stage of desired pasture grass species  aControle Químico  aErva Daninha  aHerbicida1 aROMA-BURGOS, N.1 aLANGARO, A. C.1 aSALAS-PEREZ, R. A.1 aROUSE, C. E.1 aFIPKE, M. V.1 aLAMEGO, F. P.  tWeed Sciencegv. 69, n. 2, p. 167-176, Mar. 2021.